Tithonus was a Trojan prince in Greek mythology, son of King Laomedon of Troy and the water nymph Strymo. Eos, the Titan goddess of dawn, kidnapped Tithonus along with Ganymede, in order to make them her lovers. She then asked Zeus to grant Tithonus immortality, but did not think of asking to grant him eternal youth too. As a result, Tithonus aged and did not die, resulting in his strength wilting away to the point that he could no longer move his arms. All he could do was babble continuously; in the end, he turned into a cicada, hoping that death would come for him as well.
Tithonus and Eos had two sons, Memnon and Emathion. Memnon participated in the Trojan War on the side of the Trojans, but was killed by Achilles. Eos asked Zeus to make her son immortal, which the god did. Emathion, on the other hand, became the king of Aethiopia, and was later killed by Heracles.
Tithonus Is also called Tithonos.